Arrange the following in the increasing order of ionic character : `KCl, MgCl_2 , CaCl_2, BeCl_2`.

Explanation

To arrange the compounds \( KCl, MgCl_2, CaCl_2, BeCl_2 \) in increasing order of ionic character, we can use Fajans' rules, which help us understand the covalent and ionic character of compounds based on the size of the cation and the charge.

### Step-by-Step Solution:

1. **Identify the Cations and Anions:**
- The compounds consist of cations and anions:
- \( KCl \): \( K^+ \) and \( Cl^- \)
- \( MgCl_2 \): \( Mg^{2+} \) and \( Cl^- \)
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